Operate rotary dial switch with servo motor

This was a bit of a contrived idea, in order to switch one amplified audio signal among twelve speakers. All in all this solution is much more expensive (and probably error prone) than using a series of mechanical relays, and one would have to come up with a construction to hold servo and dial base together. The dials come only in up to 12 contacts, and I had forgotten that the servo does only 180° and not a full 360°.